Valve



(No ModeL) 2 SheetsSheet 1.

W. G. ADAMS.

VALVE.

No. 432,744. Patented July 22. 1890.

A A W A w masses (No Model.) 2 SheetsSheet 2 W. G. ADAMS.

VALVE.

No. 432,744. Patented July 22, 1890.

UNITED STATES PATENT OFFICE.

WILLIAM G. ADAMS, OF PHILADELPHIA, PENNSYLVANIA.

VALVE.

SPECIFICATION forming part of Letters Patent No. 432,744, dated July 22,1890.

Application filed October 23, 1889. Serial No. 327,912. (No model.)

T0 at whom it may concern.-

Be it known that 1, WILLIAM G. ADAMS, of Philadelphia, in the State ofPennsylvania, have invented certain new and useful Improvements inValves, whereof the following is a specification, reference being had tothe accompanying drawings.

In said drawings, Figure 1 represents a vertical longitudinal sectionthrough the valvechest and valve. Fig. 2 is an exterior side View of analternative form of valve-chest, differing somewhat in detail from thatshown in Fig. 1, but operating upon the same principle. Fig. 3 is a planView of a horizontal central section through the device shown in Fig. 2,and Fig. 4c is a vertical section of the same on the line .r w of Fig.3.

Referring to Fig. 1, A represents the valvechest, which may be providedwith screw-caps at top and bottom, as shown, and has an inletport Q andan outlet-port R for the steam or other fluid to be controlled. Thevalve-chest is divided by a transverse partition D, through which acentral opening is formed. By analogy to other forms of valves thepartition D may be conveniently termed the seat, al-

though, as will be seen hereinafter, it is not, strictly speaking, avalveseat. A hollow cylinder E fits snugly but so as to slide freely inthe opening through the seat D, and is surrounded with a packing-ring I,mounted in the seat itself, the tightness of whose joint is maintainedby means of the gland P, adapted to be set up in the usual way by meansof screw-bolts. Around one end of the cylinder E is an annular flange N,having openings that fit snugly upon the elongated heads 0 of thegland-bolts, which thus serve as guides for the longitudinal movement ofthe cylinder and prevent it from turning.

Longitudinal movement of the cylinder is produced (in the instance shownin Fig. 1) by means of a screw-stem C, which passes out through astuffing-box B in the top of the chest, and is provided with an exteriorhandwheel, said stem being of course secured against longitudinalmovement. The screwthread G of said stem engages with acorrespondingly-threaded hub V, supported upon der E. A closedcylindrical head J, of the same external diameter as the cylinder E, ismounted to slide freely upon the lower end of the stem 0, and isprovided with a stud K, engaging with auotherportion H, of thescrewthread thereof.

By reference to the drawings it will be seen that a portion of thethread which is immediately adjacent to the lower end of the stem has amore rapid pitch, as seen at H, than the remainder of the thread G.

Guide-pins L are mounted upon the end of the head J adjacent to the opencylinder E, and slide between guidii'lg-lugs M on the inner facethereof, so that the head cannot turn with the screw, but must be movedlongitudinally thereby. It will be seen that by rotation of the stem 0in the direction of the arrow an upward longitudinal movement of boththe open cylinder E and the closed head J will be eifected, and byreason of the differing pitch of the threads G and II the head J willmove faster and overtake the cylinder. The point where the rapid threadH merges into the slow thread G exactly corresponds with an amount ofmovement on the part of the head J sufficient to bring its face intoclose contact with the proximate end of the cylinder E, and thereuponthey will cont-inue to move together with the same velocity throughoutthe remainder of their range of motion, which range may be convenientlydetermined (in that direction) by contact of a beveled flange S upon thehead with the correspondingly-beveled surface '1 upon the seat D.

The packing-ring I makes a steam-tigh joint between the inner surface ofthe opening through the seat D and the exterior surface of the cylinderE or head J, according as the one or the other may be opposite to saidpacking. Reversing the rotation of the screwstem 0 will of course shiftthe cylinder E and head J in a direction opposite to that justdescribed, maintaining them in close contact with one another during aportion of their time, but causing the head to open out from thecylinder when the differential threads become respectively operative.The head J and the cylinder E thus form a two-part piston, which, whenseparated, affords a free passage through the part remaining in theseat;

ing-bolts O O.

.stem 0'. number of devices mightbe employed to shift the cylinders inthe manner described, and as but when the head J has been drawn close upagainst the end of the cylinder and shifted so as to bring its ownsurface opposite to the packing-ring I a tight joint is thereby formed.

It will be observed that the device is so constructed as to occasion aclose contact between the two parts J and E before the line of contactgets opposite to the packing-ring I. This feature is one of great value,because the tendency of steam or other fluid under great pressure is todestroy and blow out the packing should there be any substantialexposure of its surface to the action of the steam. By causinga closeapproach between them this destructive action is absolutely preventedand the efficiency of the packing is maintained in use.

I will now proceed to describe an alternative form of construction ofthe valve chest and seat, which is shown in Figs. 2, 3, and 4, theobject of which is to aiford convenient access to the glands of thepacking-rings without the necessity of taking the valve-chest apart. Iaccomplish this by the use of a divided or twopart seat mounted withinan open support, in combination with a two-part piston whose hollow orperforate portion constitutes the duct between the two parts of theseat. In said Figs. 2, 3, and 4:, A represents what may by analogy betermed the valve-chest, which is substantially cylindrical in form, buthas about half of its periphery cut away for some distance on each sideof its longitudinal center, so as to expose the interior. The inlet-pipeQ and outlet-pipe R for steam enter at opposite ends of the cylinder Aand terminate in two open heads D D, respectively, which face each otherwith an opening or interval between them opposite to the cut-awayportion of the cylinder. These two heads constitute the divided ortwo-part seat, and they are respectively provided with packing-rings I1', controlled by glands P P and ti ghten- The valve is composed, asbefore, of a hollow cylinder E and a closed head J, said hollow cylinderbeing mounted .its movement in the proper direction to close the valve.

The closed head is indicated byJ, and the two together are mounted insuch manner as to be moved in the desired relation upon the As, however,any one of a great no particular form is essential to my claim, I havemerely indicated the existence of a supporting and actuating stem inthese figures.

The steam or other fluid is admitted at Q and may pass out at" anyconvenient aperture on the opposite side of the apparatus. The operationof this form of device is obvious. Thus to close the valve the head J isdrawn up into close contact with the end of the cylinder E, and the twoare then shifted thus in contact until the periphery of the head J isopposite to or extends across the face of the packing-ring 1 Movement inthe contrary direction to open the valve is so applied as to first shiftthe cylinder and head while in contact past the packing-ring I and thenallow them to separate. This organization of the parts in an opensupport or chest has the advantage, as above mentioned, of admittingaccess to the bolts 0 0 so that the packingrings 1 I can be easily setup and a close joint maintained. There is, however, no difference in thetheory of operation of those parts which constitute the valve proper.

I am aware that the use of a piston in connection with a slide-valve isnot new, and I do not broadly claim the same. The difference in theoperation of my improved valve and an ordinary piston-valve is, however,sufficiently obvious, and I merely advert to such form of device toavoid misconstruction of my claims.

I am aware that the use of a piston-valve having a packing-ring insertedtherein, in

combination with a tubular shield, is not new,

and I do not claim such method of construction, the purpose of myinvention being to permit the use of a packing-ring in the seat itselfas distinguished from the valve, and to so combine therewith a two-partpiston as that one of the parts shall afford a passage for the steamwhen the valve is open.

As before stated, I do not limit myself to any particular shiftingmechanism for effecting the necessary movements of the valve;

nor doIintend, by the use of the words cyl-- inder and head indescribing the two parts of the piston, to limit myself to the preciseform of such parts shown in the drawings, it being only necessary thatone of said partsshould .be imperforate or closed against the passage offluid, while the other is perforated and so arranged as to remain withinthe seatwhen the valve is open. So, also, by the use of the word seat asa convenient term for that portion of the apparatus in which the pistonparts act I do not intend to limit myself to the use of a partitionbetween two chambers, as shown in Fig. 1, but I mean to include anyduct, whether continuous or otherwise, whose inner surface is adapted toform a close joint around the piston parts, and whose configurationpermits their proper movements.

Having thus described my invention, I claim- 1. The combination, with aseat, of a pack ing-ring mounted therein, a two-part piston each ofwhose parts is adapted to fit within said packing-ring, one of saidpiston parts being imperforate, the other of said piston parts beingperforated, said perforated part being arranged within the seat inContact with the packing-ring thereof, and means whereby said pistonparts may be shifted relatively to one another and to the seat to bringthe periphery of either the perforated or imperforate part into contactwith said packing.- ring, substantially as set forth.

2. The Combination, with an open support, of a two-part seat mountedtherein, packingrings mounted in each part of the seat, atwopart piston,one of said piston parts being imperforate, the other of said pistonparts being perforated, said perforated part extending across theopening between the two parts of the seat, and means whereby one of saidpiston parts may be shifted relatively to the other and both may beshifted relatively to said two-part seat to bring either of said pistonparts into contact with one of said packing-rings, substantially as setforth.

WVM. G. ADAMS. l/Vitnesses:

R. T. ROBERTS, '1. S. GARLIsLE.

